The paper respectively studies the principles and features for profiling attachment and slider crank mechanism to be used as clamping apparatus to fabricate oval hand hole cover.
分别对凸轮靠模和曲柄滑块机构作为工装加工椭圆手孔盖的原理及特点进行了探讨。
The man shoves the iron cover back over the hole and takes the woman's hand, and together they run grinning down the street.
那男人将井盖盖好，然后拉起女人的手。 随后两人笑着沿着大街跑了。
Safety and easy operation: hidden air leaking hole for opening fixture cover easily while pulling up hand lever of the upper cover.
操作方便，安全：隐藏式泄气孔，拉起上盖把手即可打开治具，操作简易，安全性高。
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